package com.zhc.community.event;

import com.alibaba.fastjson.JSONObject;
import com.zhc.community.entity.DiscussPost;
import com.zhc.community.entity.Event;
import com.zhc.community.entity.Message;
import com.zhc.community.service.DiscussPostService;
import com.zhc.community.service.ElasticsearchService;
import com.zhc.community.service.MessageService;
import com.zhc.community.util.CommunityConstant;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

@Component
public class EventConsumer implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(EventConsumer.class);

    @Resource
    private MessageService messageService;

    @Resource
    private DiscussPostService discussPostService;

    @Resource
    private ElasticsearchService elasticsearchService;

    @KafkaListener(topics = {TOPIC_COMMENT,TOPIC_LIKE,TOPIC_FOLLOW})
    public void handleCommentMessage(ConsumerRecord record){
        if (record == null || record.value() == null){
            logger.error("消息的内容为空");
            return;
        }

        Event event = JSONObject.parseObject(record.value().toString(),Event.class);
        if (event == null){
            logger.error("消息格式错误");
            return;
        }

        //发送系统通知（将event构造成Message格式发送,复用之前的Message表）
        Message message = new Message();
        message.setFromId(SYSTEM_USER_ID);
        message.setToId(event.getEntityUserId());
        message.setConversationId(event.getTopic()); //此处的会话id存的不是会话id，存的是事件的主题（点赞、关注、评论）
        message.setCreateTime(new Date());

        Map<String,Object> content = new HashMap<>();    //用于存放事件的内容，后面再转化成json格式存入message
        content.put("userId",event.getUserId());
        content.put("entityType",event.getEntityType());
        content.put("entityId",event.getEntityId());

        if (!event.getData().isEmpty()) {
            for (Map.Entry<String, Object> entry : event.getData().entrySet()) {
                content.put(entry.getKey(), entry.getValue());
            }
        }

        message.setContent(JSONObject.toJSONString(content)); //将数据转成JSON格式
        messageService.addMessage(message);//存入message
    }

    //消费发帖事件
    @KafkaListener(topics = TOPIC_PUBLISH)
    public void handlePublishMessage(ConsumerRecord record){
        if (record == null || record.value() == null){
            logger.error("消息的内容为空");
            return;
        }

        Event event = JSONObject.parseObject(record.value().toString(),Event.class);
        if (event == null){
            logger.error("消息格式错误");
            return;
        }

        DiscussPost post = discussPostService.findDiscussPostById(event.getEntityId());
        elasticsearchService.saveDiscussPost(post);
    }

    //消费删帖事件
    @KafkaListener(topics = TOPIC_DELETE)
    public void handleDeleteMessage(ConsumerRecord record){
        if (record == null || record.value() == null){
            logger.error("消息的内容为空");
            return;
        }

        Event event = JSONObject.parseObject(record.value().toString(),Event.class);
        if (event == null){
            logger.error("消息格式错误");
            return;
        }
        elasticsearchService.deleteDiscussPost(event.getEntityId());
    }

}
